WO2022239608A1 - Dispositif de transmission - Google Patents

Dispositif de transmission Download PDF

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Publication number
WO2022239608A1
WO2022239608A1 PCT/JP2022/018110 JP2022018110W WO2022239608A1 WO 2022239608 A1 WO2022239608 A1 WO 2022239608A1 JP 2022018110 W JP2022018110 W JP 2022018110W WO 2022239608 A1 WO2022239608 A1 WO 2022239608A1
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WO
WIPO (PCT)
Prior art keywords
signal
synchronous
modulator
output
unit
Prior art date
Application number
PCT/JP2022/018110
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English (en)
Japanese (ja)
Inventor
敬彦 鈴木
Original Assignee
株式会社日立国際電気
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Publication date
Application filed by 株式会社日立国際電気 filed Critical 株式会社日立国際電気
Priority to JP2023520940A priority Critical patent/JPWO2022239608A1/ja
Publication of WO2022239608A1 publication Critical patent/WO2022239608A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/12—Arrangements for observation, testing or troubleshooting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to an FM transmission apparatus having redundancy against modulator abnormalities.
  • Transmission devices for broadcasting are designed to be redundant in order to prevent the suspension of broadcasting due to sudden events such as device failure.
  • two transmitters that emit different RF signals are used, one of which is used normally (active system) and the other is used as a spare transmitter (standby system) when the active system fails.
  • a configuration is known in which a switch is used to switch between the output of the active system transmission unit and the output of the standby system transmission unit according to the demand.
  • the switch since it takes a certain amount of time for the switching operation to be performed by the switch, there is a period during which the output is interrupted during this switching operation.
  • the requirements for the reliability and characteristics of the switch used for this purpose have become stricter, the switch has become more expensive.
  • the two transmission units are not divided into two, the active system and the standby system, as described above, but the RF signal that is the output of each is divided into two, and the RF signal after distribution is divided into two.
  • a transmission device is described that combines and outputs after changing the combination according to the situation. According to this configuration, interruption of the signal at the time of switching is suppressed. However, even in this case, the operation of switching the combination is performed, so the use of the switcher is essential. Also, the two RF signals must be synthesized while their frequencies and phases are matched.
  • Patent Document 2 by providing a phase controller, the frequency and phase of the RF signal output by the transmission unit of the standby system match the frequency and phase of the RF signal output by the transmission unit of the active system.
  • a technique is described in which the matching RF signals are always combined and output.
  • the RF signals of the active system and the standby system and the combined signal are the same except for the intensity, and even if the active system fails and the RF signal is lost, the combined signal will be the RF signal of the standby system. signal, and the desired RF signal is obtained without any special switching action. Therefore, no interruption of the signal occurs during the switching operation.
  • JP-A-2001-326579 Japanese Patent Application Laid-Open No. 2021-34970
  • the output of the FM modulator is input to the power amplifier in the subsequent stage and emitted from the transmitter as an RF signal as described above. Since it is necessary to suppress the interruption of broadcasting due to the failure of the FM modulator, it has been desired to provide similar redundancy for the failure of the FM modulator.
  • the present invention has been made in view of such circumstances, and aims to solve the above problems.
  • the present invention is a transmission apparatus using an output signal obtained by performing FM modulation of a carrier wave with an audio signal, wherein the common audio signal is synchronized by inputting a common reference signal.
  • a synchronous first modulating unit and a synchronous second modulating unit that perform FM modulation of the common carrier wave, and a first modulated signal that is the output of the synchronous first modulating unit and the output of the synchronous second modulating unit and a synthesizing unit for synthesizing the second modulated signal and outputting it as the output signal.
  • an output signal adjusting section may be provided for controlling the first synchronous modulating section and the second synchronous modulating section to adjust the intensity of the first modulating signal and the second modulating signal.
  • the output signal adjustment unit adjusts the output level to a predetermined range based on the detected output level of the output signal or by external control, the synchronous first modulation unit, the A synchronous second modulation unit may be controlled.
  • the audio signal synthesized with a pilot signal in a stereo system is input to the first synchronous modulation section and the second synchronous modulation section, and the pilot signal and the second modulation in the first modulated signal are input to the first synchronous modulation section and the second synchronous modulation section.
  • a first modulated signal monitoring unit and a second modulated signal monitoring unit respectively recognizing the presence or absence of the pilot signal in a signal, wherein either the first modulated signal or the second modulated signal is The one output may be stopped when the pilot signal is not recognized.
  • FIG. 2 is a diagram showing a partial configuration of a transmission device according to an embodiment
  • FIG. FIG. 3 is a diagram showing a partial configuration of a conventional transmission device
  • FIG. 1 is a diagram showing the configuration of this transmission device 1. As shown in FIG.
  • FIG. 1 partially shows only the configuration up to outputting an FM signal FM-modulated with a stereo audio signal in this transmitting apparatus 1 .
  • the configuration of FIG. 1 corresponds to, for example, a portion for outputting an FM-modulated signal in the transmitting apparatus described in Patent Documents 1 and 2, and can be applied to both active and standby transmitting apparatuses. Become.
  • a synchronous first modulator (synchronous first modulator) 11 and a synchronous second modulator (synchronous second modulator) 12 that FM-modulate a carrier wave with a common audio signal are used.
  • the first modulator 11 generates FM1 (first modulated signal)
  • the synchronous second modulator 12 generates FM2 (second modulated signal).
  • the first synchronous modulator 11 and the second synchronous modulator 12 operate independently, their operations are synchronized by inputting a common reference signal.
  • FM1 and FM2 are combined by a combiner (combining unit) 13 and output as an output signal. Therefore, no switching operation is performed in this transmitting apparatus 1, so that the output signal is not interrupted at the time of switching.
  • the first synchronous modulator 11 and the second synchronous modulator 12 operate in synchronization as described above.
  • the reference signal generator 20 in FIG. 1 is used.
  • an Rb (rubidium) oscillator can be used as the reference signal generator 20 .
  • the Rb oscillator emits a 10 MHz signal and a 1 PPS (Pulse Per Second) signal, and these signals are used as a common reference signal for synchronization between relay stations located at different locations, for example, in synchronous broadcasting. used on occasion.
  • FM1 and FM2 are modulated with a common audio signal, this essentially makes FM1 and FM2 the same signal. Since the input audio signal is a stereo audio signal, both FM1 and FM2 include a pilot signal added in the stereo system.
  • the output signal obtained by combining FM1 and FM2 by the combiner 13 is the same signal as FM1 and FM2, differing only in output level (amplitude).
  • FM1 is lost when the first synchronous modulator 11 fails
  • FM2 is lost when the second synchronous modulator 12 fails. only fluctuates and the output signal becomes equal to FM2 in the former case and FM1 in the latter case. signal is obtained. Therefore, even if a failure occurs in the first synchronous modulator 11 or the second synchronous modulator 12, the output signal is not interrupted.
  • the reference signal generator 20 is a component of the transmitter 1 in FIG. 1, a similar reference signal can be input to the first synchronous modulator 11 and the second synchronous modulator 12. Insofar as the reference signal generator may be provided externally. A reference signal generator other than the Rb oscillator may be used as long as a reference signal for synchronizing the operations of the first synchronous modulator 11 and the second synchronous modulator 12 can be obtained.
  • the output signal monitor 14 and the output signal adjuster 15 are used for this purpose.
  • the output signal monitor 14 extracts a part of the output signal output from the combiner 13 via the directional coupler 31 and detects the output level (amplitude) of the output signal.
  • the output levels of FM1 and FM2 in the first synchronous modulator 11 and the second synchronous modulator 12 are output from the output signal adjustment section 15 to the first synchronous modulator 11 and the second synchronous modulator 12, respectively. It is adjustable by a directed output control signal.
  • the output signal adjuster 15 can adjust the output levels of FM1 and FM2 based on the output level of the output signal detected by the output signal monitor 14 so that the output level of the output signal is within a certain range.
  • the output signal adjustment unit 15 varies the output levels of FM1 and FM2 and recognizes the output level of the output signal, for example, even if the output level of one of FM1 and FM2 is abnormally low, the other By increasing the output level, it is possible to perform an operation in which the output level of the output signal is kept within a certain range. In this case, it takes a certain amount of time to complete this operation, and although the output level of the output signal fluctuates during this period, there is no interruption in the output signal during this period. Moreover, such adjustment of the output levels of FM1 and FM2 by the output signal adjusting section 15 may be performed from outside the transmitting apparatus 1 . At this time, for example, an output signal monitor may be provided outside.
  • the output signal adjustment unit 15 is operated to detect a failure in one of the first synchronous modulator 11 and the second synchronous modulator 12, for example. It is not necessary to recognize the effect directly.
  • the first modulated signal monitoring unit 16 and the second modulated signal monitoring unit 17 in FIG. 1 directly recognize that a failure has occurred in the synchronous first modulator 11 and the synchronous second modulator 12. . This point will be described below.
  • stereo audio signals are used here.
  • this audio signal actually uses a left signal (L) and a right signal (R), as described in Japanese Unexamined Patent Application Publication No. 2007-103986, for example.
  • a composite signal is obtained by synthesizing the 19 kHz pilot signal.
  • L and R can be reproduced properly using this pilot signal. Therefore, under the precondition that the audio signal is of the stereo system, FM1 and FM2 always include this pilot signal.
  • the first modulated signal monitoring unit 16 receives a portion of FM1 via a directional coupler 32
  • the second modulated signal monitoring unit 17 receives a portion of FM2 via a directional coupler 33.
  • the first modulated signal monitoring section 16 and the second modulated signal monitoring section 17 check whether or not there is a pilot signal. If the pilot signal is not seen in FM1, it can be assumed that the first synchronous modulator 11 is not working properly, and similarly for FM2 (second synchronous modulator 12). In this way, when the pilot signal is not recognized in FM1, the first modulated signal monitoring unit 16, and when the pilot signal is not recognized in FM2, the second modulated signal monitoring unit 17 instructs the control unit 18. issue an alarm.
  • the control unit 18 outputs on/off control signals for controlling power supply (on/off) to the first synchronous modulator 11 and the second synchronous modulator 12 . Therefore, the control unit 18 operates the synchronous first modulator 11 when receiving an alarm from the first modulated signal monitoring unit 16, and operates the synchronous first modulator 11 when receiving an alarm from the second modulated signal monitoring unit 17. 2 modulators 12 can be turned off respectively.
  • the operation of the output signal adjusting section 15 as described above allows the output level of the output signal to be within the appropriate range. That is, by using the output signal adjusting section 15, the first modulated signal monitoring section 16, and the second modulated signal monitoring section 17 as described above, either the first synchronous modulator 11 or the second synchronous modulator 12 Even if a failure occurs in the output signal, the output level of the output signal can be maintained within a certain range without causing an interruption in the output signal.
  • FIG. 2 shows a partial configuration of a conventional transmission device 9 to be compared, corresponding to FIG.
  • this transmitting device 9 two independent ordinary FM modulators, a first modulator 91 and a second modulator 92, are used for FM modulation in the same manner as in the transmitting device 1 described above.
  • the carrier wave is FM-modulated to generate an FM signal (FM11 by the first modulator 91 and FM12 by the second modulator 92).
  • the first modulator 91 is used as the active system and the second modulator 92 is used as the standby system.
  • the first modulator 91 and the second modulator 92 do not operate synchronously.
  • both the first modulator 91 and the second modulator 92 have a self-diagnostic function, and if an alarm is issued when an abnormality occurs, the control unit 93 responds to an external command or this alarm. Accordingly, the switch 94 can be controlled to select the output FM11 from the first modulator 91 and the output FM12 from the second modulator 92 and output to the power amplifier side. At this time, the unselected side of FM11 and FM12 is input to the terminator 95 and disappears.
  • FM11 is normally selected and FM12 is led to the terminator 95, and when the alarm is issued from the first modulator 91, the control section 93 selects the second modulator 92 (FM12) and is switched to the terminator 95.
  • the synchronous first modulator 11 and the synchronous second modulator By using the modulator 12 and using the combiner 13 instead of the switch 94, even if a failure occurs in either the synchronous first modulator 11 or the synchronous second modulator 12, the output There are no interruptions in the signal.
  • the output level of the output signal may fluctuate.
  • the output level can be kept within a certain range by using the output signal adjusting section 15, the first modulated signal monitoring section 16, the second modulated signal monitoring section 17, etc. as described above.
  • the present invention is suitable for obtaining a transmission device with a simple structure that has redundancy against FM modulator failure and does not require switching operation.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Transmitters (AREA)

Abstract

L'objectif de la présente invention est d'obtenir un dispositif de transmission ayant une structure simple qui possède une redondance contre une défaillance d'un modulateur FM et ne requiert pas d'opération de commutation.　À cet effet, l'invention concerne un premier modulateur synchrone 11 et un second modulateur synchrone 12 qui sont indépendants l'un de l'autre et qui modulent en FM une onde porteuse à l'aide d'un signal audio commun, la FM1 étant générée par le premier modulateur synchrone 11, et la FM2 étant générée par le second modulateur synchrone 12. Bien que le premier modulateur synchrone 11 et le second modulateur synchrone 12 fonctionnent indépendamment, les opérations desdits modulateurs sont synchronisées par l'entrée d'un signal de référence commun. Dans le dispositif de transmission 1, les FM1 et FM2 sont combinées par un combineur 13 et générées sous la forme d'un signal de sortie. Par conséquent, aucune opération de commutation n'est effectuée dans le dispositif de transmission 1 et le signal de sortie n'est pas interrompu au moment de la commutation.
PCT/JP2022/018110 2021-05-10 2022-04-19 Dispositif de transmission WO2022239608A1 (fr)

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JP2021-079438 2021-05-10

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61205078A (ja) * 1985-03-08 1986-09-11 Nec Corp テレビジヨン放送機
JPH0879727A (ja) * 1994-09-06 1996-03-22 Matsushita Electric Ind Co Ltd Ｃａｔｖシステム
JPH11508741A (ja) * 1995-06-28 1999-07-27 セイコー コミュニケーションズ システムズ インコーポレイテッド 無線データ通信システムにおける冗長ハードウェア間のスイッチングのための方法および装置
JP2002064410A (ja) * 2000-08-23 2002-02-28 Toshiba Corp デジタル放送変調信号現用・予備切替送出装置
JP2006054813A (ja) * 2004-08-16 2006-02-23 Toshiba Corp デジタル変調装置およびその変調制御方法
JP2008017199A (ja) * 2006-07-06 2008-01-24 Nec Saitama Ltd 無線送信機および位相補正方法
US9510060B1 (en) * 2014-12-31 2016-11-29 The Directv Group, Inc. Redundant universal transport processing system
JP2017098811A (ja) * 2015-11-26 2017-06-01 日本電気株式会社 変調装置、変調器及び切替え方法
JP2017147503A (ja) * 2016-02-15 2017-08-24 株式会社東芝 送信システム
JP2020077984A (ja) * 2018-11-08 2020-05-21 株式会社アドバンステクノロジー 送信機異常検知装置

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61205078A (ja) * 1985-03-08 1986-09-11 Nec Corp テレビジヨン放送機
JPH0879727A (ja) * 1994-09-06 1996-03-22 Matsushita Electric Ind Co Ltd Ｃａｔｖシステム
JPH11508741A (ja) * 1995-06-28 1999-07-27 セイコー コミュニケーションズ システムズ インコーポレイテッド 無線データ通信システムにおける冗長ハードウェア間のスイッチングのための方法および装置
JP2002064410A (ja) * 2000-08-23 2002-02-28 Toshiba Corp デジタル放送変調信号現用・予備切替送出装置
JP2006054813A (ja) * 2004-08-16 2006-02-23 Toshiba Corp デジタル変調装置およびその変調制御方法
JP2008017199A (ja) * 2006-07-06 2008-01-24 Nec Saitama Ltd 無線送信機および位相補正方法
US9510060B1 (en) * 2014-12-31 2016-11-29 The Directv Group, Inc. Redundant universal transport processing system
JP2017098811A (ja) * 2015-11-26 2017-06-01 日本電気株式会社 変調装置、変調器及び切替え方法
JP2017147503A (ja) * 2016-02-15 2017-08-24 株式会社東芝 送信システム
JP2020077984A (ja) * 2018-11-08 2020-05-21 株式会社アドバンステクノロジー 送信機異常検知装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SASAKI, AKIRA, NAKAMURA, HIROAKI, KAJIWARA, KENICHIRO, ARAI, YASUTOSHI, SAITO, TOMOTAKE, DEGUCHI, KIMIHIKO, NOZAWA, YUKA, KATO, TA: "Second opening, The overview of equipment in J-WAVE new head office", BROADCASTING TECHNOLOGY, vol. 57, no. 3, 1 January 2004 (2004-01-01), JP , pages 271 (81) - 294 (104), XP009541169, ISSN: 0287-8658 *

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